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Old 10-03-2017, 12:18 PM   #1
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Default Any interest in 9mm integrals anymore?

We are throwing the idea around of building a 9mm integral on an AR chassis, is there still interest in this design or are we about to spend a bunch of time on a gun nobody wants?

Dave
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Old 10-03-2017, 12:42 PM   #2
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Sure it sounds interesting. Would you guys be using a magwell adapter or a dedicated lower that uses Glock, Colt or other magazines? Blowback or DI? I personally just 'slapped together' a PSA blowback 9mm SBR with 4" bbl with a Rugged Obsidian nested in the handguard. It's fun enough, but I feel there's a lot of port pop compared to my DI 45 SBR. So I'm not chomping at the bit to get another 9mm AR, but that's just me. I'd love to see what you guys could do with what sounds like a 9mm Leonidas.
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Old 10-03-2017, 12:58 PM   #3
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Quote:
Originally Posted by sub View Post
We are throwing the idea around of building a 9mm integral on an AR chassis, is there still interest in this design or are we about to spend a bunch of time on a gun nobody wants?

Dave
Make it not blowback IMO. Whether its some sort of DI (easier since it is integral), Piston like an MPX or setup like the CMMG. When you're controlling everything do something beyond integral IMO.
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Old 10-03-2017, 01:18 PM   #4
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If it takes glock mags and has a barrel + suppressor length under 12", you'd probably have my attention. Unless the price tag exceeds the value of my jeep
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Old 10-03-2017, 01:23 PM   #5
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Agreed. I'm not sure I want a(nother) blowback 9mm AR.
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Old 10-03-2017, 02:07 PM   #6
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Accuracy and reliability are top priorities for me add in great suppression and im looking.
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Old 10-03-2017, 04:13 PM   #7
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Quote:
Originally Posted by ryanh487 View Post
If it takes glock mags and has a barrel + suppressor length under 12", you'd probably have my attention. Unless the price tag exceeds the value of my jeep
Pretty much this.
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Old 10-03-2017, 06:27 PM   #8
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Originally Posted by ryanh487 View Post
If I can use my Glock mag lower and has a barrel + suppressor length under 12", you'd probably have my attention. Unless the price tag exceeds the value of my jeep
FIFY
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Old 10-03-2017, 06:33 PM   #9
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FIFY
that too. I already have a stripped PSA glock mag lower in the project box, but I could probably be pursuaded to just build 2 9mm ARs
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Old 10-03-2017, 07:35 PM   #10
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Welrod Doomstick?
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Old 10-03-2017, 09:18 PM   #11
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on a blowback upper, i'd have no interest.

on a DI or Delayed blowback upper. that'd be slick.
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Old 10-03-2017, 10:22 PM   #12
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The blowback M11 Lage and Mech Tech are quiet at the port, but the bolt weighs over 2 lbs.
Fuliatomatix DI 45 is just a hair louder at the port than those above. Impressive. Wonder if instead you could do a piston setup inside the silencer tube?

The bolt face on a standard 223 AR is pretty close to the 9mm casing size. Would the rotation of a 223 bolt be enough to delay port opening on a 9mm blowback conversion?

I have to admit, shooting the 9mm lage (distal radius) and mech tech (romilyu) is super fun, but i would take an equally quiet 45 over it for the higher bullet mass.


Edit: looks like all cmmg did is cut an angle on the aft ar15 bolt locking lugs so it would unlock with the backwards force of the case.

Last edited by owensww; 10-04-2017 at 02:31 PM.
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Old 10-04-2017, 10:20 PM   #13
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Quote:
Originally Posted by owensww View Post
The blowback M11 Lage and Mech Tech are quiet at the port, but the bolt weighs over 2 lbs.
Fuliatomatix DI 45 is just a hair louder at the port than those above. Impressive. Wonder if instead you could do a piston setup inside the silencer tube?

The bolt face on a standard 223 AR is pretty close to the 9mm casing size. Would the rotation of a 223 bolt be enough to delay port opening on a 9mm blowback conversion?

I have to admit, shooting the 9mm lage (distal radius) and mech tech (romilyu) is super fun, but i would take an equally quiet 45 over it for the higher bullet mass.


Edit: looks like all cmmg did is cut an angle on the aft ar15 bolt locking lugs so it would unlock with the backwards force of the case.
you can't have a rotating locking bolt on a blow back setup. it couldn't cycle.
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Old 10-04-2017, 10:29 PM   #14
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you can't have a rotating locking bolt on a blow back setup. it couldn't cycle.
depends on how far it rotates, Benelli Inertia, reliability debatable
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Old 10-04-2017, 11:35 PM   #15
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Quote:
Originally Posted by srt-4_uk View Post
you can't have a rotating locking bolt on a blow back setup. it couldn't cycle.
radial delayed blowback is a thing
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Old 10-04-2017, 11:37 PM   #16
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Quote:
Originally Posted by owensww View Post
Edit: looks like all cmmg did is cut an angle on the aft ar15 bolt locking lugs so it would unlock with the backwards force of the case.
The barrel extension lugs are angled as well. There's some other changes to the bcg, but nothing conceptually significant.
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Old 10-05-2017, 01:14 AM   #17
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Quote:
Originally Posted by doubloon View Post
depends on how far it rotates, Benelli Inertia, reliability debatable
inertia isn't the same as blow back.
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Old 10-05-2017, 07:54 AM   #18
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Quote:
Originally Posted by srt-4_uk View Post
you can't have a rotating locking bolt on a blow back setup. it couldn't cycle.
Cmmg altered the lugs on their 45 version so that the recoil of the case turns the bolt.
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Old 10-05-2017, 04:02 PM   #19
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Nice information about the wants at this time. It never occurred to me to worry with locked breech, now I know it matters! Thanks guys, projects are moving forward around here, albeit slowly, but they are moving.

Dave
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Old 10-07-2017, 07:52 PM   #20
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Quote:
Originally Posted by srt-4_uk View Post
you can't have a rotating locking bolt on a blow back setup. it couldn't cycle.

tell that to my B&T TP9
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